1、現(xiàn)在完成時表示從過去持續(xù)到現(xiàn)在的動作或狀態(tài),此時通常與由since或for引導(dǎo)的時間狀語連用,例如：I have waited here since three o'clock.我從3點(diǎn)鐘就在這里等.
I have waited here for three hours.我在這里等了三個小時了.
2、現(xiàn)在完成時表示過去發(fā)生的對現(xiàn)在有影響的動作,有時可以和already,before,ever,just,lately,never,recently,yet等一些所指時間不具體的時間狀語連用,如：
I have lost my key.我把鑰匙丟了.
Have you ever been to Australia?你去過澳大利亞嗎?
有時現(xiàn)在完成時也和now,today,this morning,this week,this year等表示現(xiàn)在的時間連用,例如：
I havent seen him today.我今天沒見過他.
They have produced five films this year.他們今年拍了五部電影.
3、現(xiàn)在完成時在時間和條件狀語從句中表示將來完成的動作,例如：I will come this evening if the rainhas stopped by then.如果晚上雨停的話我就來.